Gale does not appear on a list of potential witnesses.
Just last year, Bea testified for plaintiffs who sued the U.S. Army Corps of Engineers over broken levees in New Orleans following Hurricane Katrina.
In the BP case, U.S. Justice Department attorney Mike Underhill said the catastrophe resulted from the company's "culture of corporate recklessness."
"The evidence will show that BP put profits before people, profits before safety and profits before the environment," Underhill said. "Despite BP's attempts to shift the blame to other parties, by far the primary fault for this disaster belongs to BP."
BP attorney Mike Brock acknowledged the oil company made mistakes. But he accused Transocean of failing to properly maintain the rig's blowout preventer, which had a dead battery, and he claimed cement contractor Halliburton used a bad slurry" that failed to prevent oil and gas from traveling up the well.
BP has already pleaded guilty to manslaughter and other criminal charges and has racked up more than $24 billion in spill-related expenses, including cleanup costs, compensation for businesses and individuals, and $4 billion in criminal penalties.
But the federal government, Gulf Coast states and individuals and businesses hope to convince a federal judge that the company and its partners in the ill-fated drilling project are liable for much more in civil damages under the Clean Water Act and other environmental regulations.
One of the biggest questions facing U.S. District Judge Carl Barbier, who is hearing the case without a jury, is whether BP acted with gross negligence.
Under the Clean Water Act, a polluter can be forced to pay a minimum of $1,100 per barrel of spilled oil; the fines nearly quadruple to about $4,300 a barrel for companies found grossly negligent, meaning BP could be on the hook for nearly $18 billion.